Abstract A set of deep-water gravity flow deposits with sand-mud couples are developed in the Ordovician Lashizhong Formation in the western margin of the Ordos Basin,and the gravity flow complex channel is developed in the lower part. Based on field measurement,microscopic observation and grain size analysis,the sedimentary characteristics,process and main controlling factor of complex channel are discussed,and finally the sedimentary models were established. The results show that: (1)Five lithofacies and three lithofacies associations are developed in the study area,namely massive bedding calcirudite lithofacies(Cm),graded bedding fine-siltstone lithofacies(Sg),parallel bedding sandstone lithofacies(Sp),cross bedding siltstone lithofacies(Sc) and horizontal bedding(mud)shale lithofacies(Sh),indicating debris flow deposits(Cm),turbidites(Sg,Sp,Sc) and deep-water autochthonous deposits(Sh). (2)According to the morphology,lithofacies association and grain size of single channel,the complex channel is divided into four stages,reflecting a gradually decreased gravity flow energy. (3)The multi-stage filling and evolution of complex channel are closely related to relative sea-level change,sediment supply,regional tectonic activities and gravity flow size and energy change. (4)The gravity flow sedimentation in the study area is a complex channel sedimentary system formed in a slope-basin environment. This study can improve the understanding of gravity flow channel in the study area and provide reference for oil and gas exploration.
Fund:Co-funded by the National Natural Science Foundation of China(Nos.41472113,41502101),National Science and Technology Major Project(No.2017ZX05032-002-003),Natural Science Foundation of Hubei Province(No.2020CFB745) and Open Foundation of Top Disciplines in Yangtze University of China(No.2019KFJJ0818010)
Corresponding Authors:
LI Hua,born in 1984,a associate professor in School of Geosciences,Yangtze University,is engaged in sedimentology. E-mail: 501026@yangtzeu.edu.cn.
About author: TAN Mengting,born in 1997,a postgraduate in School of Geosciences,Yangtze University, is engaged in sedimentology. E-mail: 2479713996@qq.com.
Cite this article:
TAN Mengting,LI Hua,HE Youbin et al. Characteristics and evolution of complex channel in the Ordovician Lashizhong Formation in western margin of Ordos Basin[J]. JOPC, 2023, 25(1): 119-132.
TAN Mengting,LI Hua,HE Youbin et al. Characteristics and evolution of complex channel in the Ordovician Lashizhong Formation in western margin of Ordos Basin[J]. JOPC, 2023, 25(1): 119-132.
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